He said: “As the Guild tram line gets closer we wanted to show Preston, and its politicians, how the tram could operate in the city.

“The Guild tramway will change the transport system of Preston. It will increase capacity and offer an alternative for many car trips, that get stuck in congestion and add to toxic traffic pollution.

“We need to satisfy ourselves that the Guild Tramway can operate safely and effectively, without disrupting other traffic, so we have commissioned a survey of key traffic junctions.

“Government policy is for trams should have priority over other traffic at road junctions” “This is usually achieved by trams getting an immediate green signal. Without this we have calculated that there will be a passenger delay on average of 25minutes per tram having to wait a turn for a green traffic light.”

One of the trams which could come to Preston, and an artist impression of the Deepdale station

Professor Lesley says they are targeting a fee-taking tram service, with 12 stops, to be in use by 2019.

Modal TP director Petros Price said: “We are measuring the traffic movements at two key junctions for three days during the week. We will know the exact numbers and types of vehicles and how much delay that is presently experienced. This will be for both peak and off peak periods.

“From this we can model the impact of Guild trams with different junction control scenarios, and to see if there are statistically difference in the flows on the days surveyed.”